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app/api/counters/[id]/route.ts

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+import { NextResponse } from 'next/server';
+import fs from 'fs';
+import path from 'path';
+import db, { UPLOADS_DIR } from '@/lib/db';
+
+export const dynamic = 'force-dynamic';
+
+type Params = { params: Promise<{ id: string }> };
+
+export async function GET(_req: Request, { params }: Params) {
+  const { id } = await params;
+  const counter = db.prepare('SELECT * FROM counters WHERE id = ?').get(Number(id));
+  if (!counter) return NextResponse.json({ error: 'Not found' }, { status: 404 });
+  return NextResponse.json(counter);
+}
+
+export async function PUT(request: Request, { params }: Params) {
+  const { id } = await params;
+  const body = await request.json();
+  const existing = db.prepare('SELECT * FROM counters WHERE id = ?').get(Number(id)) as Record<string, unknown> | undefined;
+  if (!existing) return NextResponse.json({ error: 'Not found' }, { status: 404 });
+
+  const name = body.name?.trim() ?? existing.name;
+  const value = body.value !== undefined ? body.value : existing.value;
+  const group_id = body.group_id !== undefined ? body.group_id : existing.group_id;
+  const image_path = body.image_path !== undefined ? body.image_path : existing.image_path;
+
+  db.prepare(
+    'UPDATE counters SET name = ?, value = ?, group_id = ?, image_path = ? WHERE id = ?'
+  ).run(name, value, group_id, image_path, Number(id));
+
+  const updated = db.prepare('SELECT * FROM counters WHERE id = ?').get(Number(id));
+  return NextResponse.json(updated);
+}
+
+export async function DELETE(_req: Request, { params }: Params) {
+  const { id } = await params;
+  const existing = db.prepare('SELECT * FROM counters WHERE id = ?').get(Number(id)) as Record<string, unknown> | undefined;
+  if (!existing) return NextResponse.json({ error: 'Not found' }, { status: 404 });
+
+  // Remove associated image if present
+  if (existing.image_path) {
+    const imgFile = path.join(UPLOADS_DIR, path.basename(existing.image_path as string));
+    try { fs.unlinkSync(imgFile); } catch { /* ignore missing file */ }
+  }
+
+  db.prepare('DELETE FROM counters WHERE id = ?').run(Number(id));
+  return new NextResponse(null, { status: 204 });
+}